I found a great emergency water carrier here from an unlikely source.

Every gas station in Brazil sells heavy gauge, five-liter plastic bags for carrying gasoline (yes, you read that right). They’re shaped like a jerry-can with a nozzle and a handle with four finger holes. These things are a product liability lawyers dream. They are actually printed gasolina, alcóol, diesel. It is a common practice here to fill these with five liters of fuel and bum a lift back to your car. Can you say self-immolation?

I bought a few of these and have them distributed among my various packs and kits for collecting, treating, transporting drinking water. You can loop a rope through the finger holes and even hang them up full of water.

I would love to see these available marked Drinking Water Only – Do NOT Fill with combustible material. Does such a product exist? Mac

I have bought some of these from this seller, they are nice and strong. He has offered in the past to sell extra bags if needed. Pete
http://cgi.ebay.com/ws/eBayISAPI.dll?ViewItem&item=2700790520&category=2020

Pete,

The bags I have down here seem simpler than that. There's no actual valve to close them off. The bags in that link look real good. Mac